Building-block.



N0. 70|,l50. Patented May 27, I902.

J. W. CHRISFURD.

BUILDING BLOCK.

(Apphcat fll 6. Yb 4 1902) (No Model.)

//v VENTOH 4 ATTOHNEYs.

LQZZYEZE EEQ m (9 rial arranged with their adjacent faces sepa- IJNiinSTATES JAMES IV. OHRISFORD,

BUILDING OF CLEVELAND, OHIO.

-BLOCK.

SPECIFICATION forming part of Letters Patent No. 701,150, dated May 27,1902.

Application filed February 4, 1902.

To all whont may concern:

Be it known that 1, Lines W. CHRISFORD, a citizen of the United Statesof America, re siding at Cleveland, in the county of Guyahoga and Stateof Ohio, have invented cer tain new and useful Improvements inBuilding-Blocks; and I hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it pertains to make and use the same. 1

This invention relates to improvement in building construction, andespecially to the production of building-blocks formed from concrete orartificial stone.

The object of my invention is to provide a building-block which will bestrong, durable, light, and capable of resisting the action of cold andmoisture.

lVith this object in view my invention consists in providing abuilding-block comprising two slabs of concrete or similar materatedfrom each other and secured together by means of a framework, comprisinga series of diagonally-arranged bars and means for looking the ends ofthe respective bars in the respective slabs.

My invention also consists of the feature of construction andcombination of parts, as illustrated in the drawings and hereinafterdescribed in the specification and pointed out in the claims.

Referring to the drawings, Figure I represents a side elevation of awall formed with my improved building-block. Fig. II shows a frontelevation of the same. Fig. III is a top plan of same. Fig. IV shows amodified construction of one of my blocks. Fig. V shows an end view ofsame.

Again referring to the drawings, a and a represent two slabs ofconcrete, artificial 7 stone, or similar material.

I) represents a metallic rod which extends diagonally from the upperportion of the slab (I. to the lower portion of the slab a. 1)represents a similar brace which extends from the upper part of the slab0. to the lower part of the slab a. The braces Z) and b are securedtogether at the point where they cross each other by means of a pin 6The braces b and b can be made of different Serial No. 92,548. (Nomodel-l lengths, according to the width of the space which it is desiredto leave between the adjacent faces of the slabs a and a. As shown inthe drawings, two sets of these crossbraces are used in the constructionof each block; but when the blocks are larger a greater number of bracescan be used. Two

rods 0 and c are embedded in each of these respective slabs a and 0.,preferably near the top and bottom thereof. These rods are arranged toengage the ends of the bracerods 11 and b and lock them in therespective slabs.

In forming the blocks the metallic frame comprising the two sets ofcross-braces b and b and the locking-rod c, is preferably firstassembled. The slabs a and a are then formed in a plastic condition, andthe ends of the cross-braces and the rod 0 are then embedded in the saidslabs. \Vhen the material forming the said slabs becomes set, the slabswill be rigidly secured together, with their adjacent faces parallel andseparated from each other.

In Figs. l and 5 is illustrated a modification of my device wherein theends of the cross-braces are bent at right angles, so as to formmeansfor locking them in the respective slabs. In this form the rod 0 wouldbe omitted.

Although the construction of my building block is quite simple, theadvantages therefore are quite apparent. The air-space be tween therespective slabs constitutesa means of ventilation, and the air in thesaid space forms an insulation which prevents frost or moisture frompenetratinginto the interior of the wall. Also the peculiar arrangementof the connecting and spacing braces makes the block capable ofresisting either a crushing or a shearing strain.

What I claim is- 1. As a new article of manufacture, a build ing-blockcomprising two slabs of concrete or similar material rigidly securedtogether by' means of a metallic framework comprising two or more setsof cross-braces connected by rods embedded in the material of therespective slabs, said slabs having their adjacent faces parallel andseparated from each other, substantially as described.

2. As anew article of manufacture, a build ing-block comprising twoslabs of concrete arranged with their adjacent faces parallel andseparated from eachother, means forsecuring said slabs together,comprising a series of braces having their end embedded in the materialof the respective slabs and extending from the upper portion of one slabto the lower similar material, one rod embedded in the up per and one inthe lower portion of each slab, and a series of cross-braces securedtogether at their center points and having their ends secured to thesaid rods in the respective slabs, the said cross-braces being arrangedso that their center points will lie without the material constitutingthe said slabs, substantially as described and for the purpose setforth.

4:. As a new article of manufacture, abuilding-block comprising twoslabs of concrete or similar material arranged with their adjacent facesseparated from each other, a series of braces arranged with their endsembedded in the material of the respective slabs, and extending from theupper portion of one slab to the lower portion of the other slab, asimilar series of braces extending from the upper portion of thelast-mentioned slab to the lower portion of the first-mentioned slab,and means embedded in the material of the said slab for locking the endsof the said braces in the respective slabs, substantially as describedand for the purpose set forth.

In testimony whereof I sign the foregoing specification, in the presenceof two witnesses, this 17th day of January, 1902, at Cleveland, Ohio. I

JAMES w. OHRISF-ORD.

Witnesses:

VICTOR O. LYNCH, TELsA SCHWARTZ.

